Effect of quenching and tempering process on microstructure and mechanical properties of a Cr-Ni-Mo-V ultra-high strength and toughness steel

doi:10.13251/j.issn.0254-6051.2024.02.020

Abstract

Abstract: Effects of quenching at 780, 830, and 880 ℃ and high-temperature tempering at 500-580 ℃ on the microstructure and mechanical properties of a Cr-Ni-Mo-V ultra-high strength and toughness steel were studied by means of scanning electron microscope, metallographic microscope, impact testing machine, and Vickers hardness tester. The results show that with the increase of tempering temperature, the carbides with larger size undergo dissolution transformation, while the alloy carbides continuously precipitate out dispersively from the the matrix. Both the hardness and impact properties show a trend of first increasing and then decreasing with the increase of tempering temperature, which are related to the dispersion morphologies of the precipitated carbides and the decomposition of retained austenite. The tested steels quenched at three different temperatures all show secondary hardening peaks when tempering at 540 ℃, with the highest hardness values being 488, 517, and 532 HV20, respectively. The maximum impact absorbed energy is obtained when tempering at 540-560 ℃, with values of 49.7, 58.5, and 51.0 J, respectively. In order to fully ensure the strength and toughness of the steel, the optimal heat treatment process is subcritical quenching at 830 ℃ and then tempering at 560 ℃.

Key words: Cr-Ni-Mo-V ultra-high strength and toughness steel, quenching and tempering treatment, secondary hardening, impact property

CLC Number:

TG142.1

Zhou Cong, Chen Xiangang, Cao Tieshan, Zhao Jie. Effect of quenching and tempering process on microstructure and mechanical properties of a Cr-Ni-Mo-V ultra-high strength and toughness steel[J]. Heat Treatment of Metals, 2024, 49(2): 135-141.

References

[1]胡春东, 曾斌, 孟利, 等. 奥氏体化温度对3Cr3Mo2NiVNb钢组织和力学性能的影响[J]. 热加工工艺, 2018, 47(22): 234-236.
Hu Chundong, Zeng Bin, Meng Li, et al. Effect of austenitizing temperature on microstructure and mechanical properties of 3Cr3Mo2NiVNb steel[J]. Hot Working Technology, 2018, 47(22): 234-236.
[2]赵振业. 超高强度钢中二次硬化现象研究[J]. 航空材料学报, 2002(4): 46-55.
Zhao Zhenye. Study on secondary hardening phenomenon in ultra-high strength steel[J]. Journal of Aeronautical Materials, 2002(4): 46-55.
[3]牛艳娥, 赵芃沛, 李宁, 等. 国内外超高强度钢的研究现状及应用[J]. 兵器装备工程学报, 2021, 42(7): 274-279.
Niu Yan'e, Zhao Pengpei, Li Ning, et al. Research status and application of ultra-high strength steel at home and abroad[J]. Journal of Ordnance Equipment Engineering, 2021, 42(7): 274-279.
[4]胡春东, 孟利, 董瀚. 超高强度钢的研究进展[J]. 材料热处理学报, 2016, 37(11): 178-183.
Hu Chundong, Meng Li, Dong Han. Research and development of ultra-high strength steels[J]. Transactions of Materials and Heat Treatment, 2016, 37(11): 178-183.
[5]马永庆, 章晓静, 梁玉芬. Cr-W-Mo-V高合金中高碳钢的显微组织及回火硬度[J]. 金属热处理, 2016, 41(4): 30-34.
Ma Yongqing, Zhang Xiaojing, Liang Yufen. Microstructure and tempering hardness of Cr-W-Mo-V high alloy medium-upper carbon steel[J]. Heat Treatment of Metals, 2016, 41(4): 30-34.
[6]王毛球, 董瀚, 王琪, 等. 25Cr3 Mo3NiNb二次硬化钢冲击性能的研究[J]. 金属热处理, 2003, 28(3): 14-17.
Wang Maoqiu, Dong Han, Wang Qi, et al. Impact toughness of secondary hardening steel 25Cr3Mo3NiNb[J]. Heat Treatment of Metals, 2003, 28(3): 14-17.
[7]吴秋平, 王春旭, 刘宪民, 等. 回火温度对 9310 钢力学性能及组织的影响[J]. 热加工工艺, 2012, 41(6): 179-183.
Wu Qiuping, Wang Chunxu, Liu Xianmin, et al. Influence of tempering temperature on mechanical properties and microstructure of 9310 steel[J]. Hot Working Technology, 2012, 41(6): 179-183.
[8]Ritchie R O, Francis B, Server W L. Evaluation of toughness in AISI 4340 alloy steel, austenitized at low and high temperatures[J]. Metallurgical and Materials Transactions A, 1976, 7(6): 831-838.
[9]Youngblood J L, Raghavan M. Correlation of microstructure with mechanical properties of 300M steel[J]. Metallurgical and Materials Transactions A, 1977, 8(9): 1439-1448.
[10]何星, 胡春东, 王子萌, 等. 30Cr2MoV枪管钢碳化物溶解与析出规律[J]. 兵工学报, 2021, 42(1): 167-174.
He Xing, Hu Chundong, Wang Zimeng, et al. Dissolution and precipitation of carbide in 30Cr2MoV barrel steel[J]. Journal of Ordnance Industry, 2021, 42(1): 167-174.
[11]周敏, 厉勇, 黄顺喆, 等. 奥氏体化温度对二次硬化渗碳钢组织与力学性能的影响[J]. 金属热处理, 2017, 42(2): 108-112.
Zhou Min, Li Yong, Huang Shunzhe, et al. Effect of austenitizing temperature on microstructure and properties of a secondary hardening carburizing steel[J]. Heat Treatment of Metals, 2017, 42(2): 108-112.
[12]罗灵杰, 胡开华. 残余奥氏体对ZG30CrMnSiMoNi钢冲击和磨损性能的影响[J]. 热加工工艺, 2023, 52(12): 1-4.
Luo Lingjie, Hu Kaihua. Effects of retained austenite on impact and wear property of ZG30CrMnSiMoNi steel[J]. Hot Working Technology, 2023, 52(12): 1-4.
[13]邓彪, 陈蓬, 王国栋. 回火温度对二次硬化马氏体不锈钢组织和性能的影响[J]. 金属热处理, 2021, 46(9): 65-71.
Deng Biao, Chen Peng, Wang Guodong. Effect of tempering temperature on microstructure and properties of secondary hardening martensitic stainless steel[J]. Heat Treatment of Metals, 2021, 46(9): 65-71.
[14]高华耀, 马党参, 周健, 等. 热处理工艺对新型高热稳定性热作模具钢组织与性能的影响[J]. 金属热处理, 2017, 42(10): 91-96.
Gao Huayao, Ma Dangshen, Zhou Jian, et al. Effect of heat treatment process on microstructure and properties of new high thermal stability hot working die steel[J]. Heat Treatment of Metals, 2017, 42(10): 91-96.
[15]Hidalgo J, Findley K O, Santofimia M J. Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering[J]. Materials Science and Engineering A, 2017, 690: 337-347.
[16]胡涛, 吴日铭, 李方杰, 等. 高强韧热作模具钢SR19的组织与力学性能[J]. 金属热处理, 2022, 47(1): 149-155.
Hu Tao, Wu Riming, Li Fangjie, et al. Microstructure and mechanical properties of high strength and toughness hot die steel SR19[J]. Heat Treatment of Metals, 2022, 47(1): 149-155.
[17]胡春东, 曾斌, 孟利, 等. 回火温度对H10MOD二次硬化钢组织和力学性能的影响[J]. 热加工工艺, 2018, 47(20): 247-249.
Hu Chundong, Zeng Bin, Meng Li, et al. Effect of tempering temperature on microstructure and mechanical properties of H10MOD secondary hardening steel[J]. Hot Working Technology, 2018, 47(20): 247-249.
[18]顿亚鹏, 杨伟, 刘建永, 等. 回火温度对37CrMnMo钢冲击性能的影响[J]. 金属热处理, 2020, 45(2): 193-196.
Dun Yapeng, Yang Wei, Liu Jianyong, et al. Effect of tempering temperature on impact property of 37CrMnMo steel[J]. Heat Treatment of Metals, 2020, 45(2): 193-196.